Which innovative retail concept, first introduced in 1916, fundamentally changed shopping by allowing customers to select their own merchandise without clerk assistance?

The retail landscape we know today wasn't built overnight. Throughout history, revolutionary product launches, marketing strategies, and shopping innovations have transformed how we buy and sell goods. This trivia question explores a pivotal moment in retail history that fundamentally changed the consumer experience and set the stage for modern shopping habits. Test your knowledge about a retail innovation that permanently altered the commercial landscape!

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Self-service grocery store (Piggly Wiggly)
Mail-order catalog (Montgomery Ward)
Department store (Bon Marché)
Vending machine retail (Horn & Hardart Automat)